Unexpected latrine
A latrine pit is a hole in the ground that people used before toilets. However, we do not expect to go into a restroom and see the toilet is missing. Especially at parties, and if we are a little tipsy, we likely need a seat when we have to pee.
A latrine pit will seem then like the most inconvenient thing ever. Is the party host just messing with their guests by moving the toilet out of the bathroom? Another annoying thing about this bathroom is the lack of toilet paper.